He______ to sing English songs when he was only six years oldA.canB.was able toC.is able toD.able to

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He______ to sing English songs when he was only six years oldA.canB.was able toC.is able toD.able to

He______ to sing English songs when he was only six years oldA.canB.was able toC.is able toD.able to
He______ to sing English songs when he was only six years old
A.can
B.was able to
C.is able to
D.able to

He______ to sing English songs when he was only six years oldA.canB.was able toC.is able toD.able to
B 过去式

B